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@ 2019-03-11T10:50:14Z

<?php 

$amsterdam = [
    65 => [
        'table'     => 'Object',
        'something' => false,
        'data'      => [
            'foo'    => 'boo',
            'price'   => 100
        ]
    ],
    173 => [
        'table'     => 'Object',
        'something' => false,
        'data'      => [
            'foo'    => 'hoo',
            'price'   => 2500
        ]
    ],
];

$prague    = [
    132 => [
        'table'     => 'Object',
        'something' => false,
        'data'      => [
            'foo'    => 'boo',
            'price'   => 2100
        ]
    ],
    956 => [
        'table'     => 'Object',
        'something' => false,
        'data'      => [
            'foo'    => 'hoo',
            'price'   => 2500
        ]
    ],
];

$lisboa    = [
    175 => [
        'table'     => 'Object',
        'something' => false,
        'data'      => [
            'foo'    => 'boo',
            'price'   => 6500
        ]
    ],
    64 => [
        'table'     => 'Object',
        'something' => false,
        'data'      => [
            'foo'    => 'hoo',
            'price'   => 20
        ]
    ],
];


$cities = [
    'amsterdam' => $amsterdam,
    'prague'    => $prague,
    'lisboa'    => $lisboa
];




$map_prices = function($n) { 
    $reduce_smallest_price = function($carry, $item) {
        return $item['data']['price'] < $carry 
                                      ? $item['data']['price'] 
                                      : $carry; 
    };
    return array_reduce($n, $reduce_smallest_price, INF); 
    
};

$cities_price = array_map($map_prices, $cities);

asort($cities_price);
uksort($cities, function($a, $b) { 
    global $cities_price; 
    return strnatcmp($cities_price[$a], $cities_price[$b]);

});

print_r($cities_price);
print_r($cities);

Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12: Array ( [lisboa] => 20 [amsterdam] => 100 [prague] => 2100 ) Array ( [lisboa] => Array ( [175] => Array ( [table] => Object [something] => [data] => Array ( [foo] => boo [price] => 6500 ) ) [64] => Array ( [table] => Object [something] => [data] => Array ( [foo] => hoo [price] => 20 ) ) ) [amsterdam] => Array ( [65] => Array ( [table] => Object [something] => [data] => Array ( [foo] => boo [price] => 100 ) ) [173] => Array ( [table] => Object [something] => [data] => Array ( [foo] => hoo [price] => 2500 ) ) ) [prague] => Array ( [132] => Array ( [table] => Object [something] => [data] => Array ( [foo] => boo [price] => 2100 ) ) [956] => Array ( [table] => Object [something] => [data] => Array ( [foo] => hoo [price] => 2500 ) ) ) )

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